A seedling is placed on its side in the dark. The shoot bends upwards because

  1. auxin collects on the upper side
  2. auxin collects on the lower side and that side grows more
  3. light is coming from above
  4. gravity pulls the shoot up
Answer

B) auxin collects on the lower side and that side grows more

Lower side elongates more. O Level Biology · Topic 15 Coordination and Response in Plants · 15.1 Coordination and response in plants

Biology MCQ · More O Level Biology: Coordination and Response in Plants MCQs · Practise